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backup all your apps and and files and then follow the factory reset steps after the reset you can try it should work.
Restore factory settings by the following steps:
Step 1: Tap Apps menu on Home screen.
Step 2: Tap Settings.
Step 3: Tap Backup & reset.
Step 4: Choose Factory data reset.
Step 5: Tap Reset tablet.
Step 6: Tap Erase everything.
Note: Resetting erases all data in the tablet. Backup before resetting (If the device has been rooted and some built-in programs and files are deleted, resetting may not solve the problem, and other issues may occur).
Please dont post new questions follow up on this one.